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Fixing Shrub Acaciella Angustissima (Mill.) Britton & Rose Inoculated with Sinorhizobium Mexicanum

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Fixing Shrub Acaciella Angustissima (Mill.) Britton & Rose Inoculated with Sinorhizobium Mexicanum Gayana Bot. 68(2),68(2): 2011188-195, 2011 ISSN 0016-5301 Aluminium tolerance in the tropical leguminous N2-fixing shrub Acaciella angustissima (Mill.) Britton & Rose inoculated with Sinorhizobium mexicanum Tolerancia al aluminio en la leguminosa arbustiva tropical fijadora de N2 Acaciella angustissima (Mill.) Britton & Rose inoculada con Sinorhizobium mexicanum REINER RINCÓN-ROSALES1, VÍCTOR M. RUÍZ-VALDIVIEZO2, JOAQUÍN A. MONTES-MOLINA1, FEDERICO A. GUTIÉRREZ-MICELI1 & LUC DENDOOVEN2* 1 Departamento de Biotecnología Vegetal, Instituto Tecnológico de Tuxtla Gutiérrez, Carretera Panamericana km 1080, C.P. 29050.Tuxtla Gutiérrez, Chiapas, México. 2 Laboratorio de Ecología de Suelos, Cinvestav, Av. Instituto Politécnico Nacional 2508, C.P. 07360 México D.F., México. *[email protected] ABSTRACT The tropical legume Acaciella angustissima inoculated with or without Sinorhizobium mexicanum ITTG R7T strain was cultivated in an aluminium (Al) spiked soil to study its tolerance towards this metal. Seedlings of A. angustissima were grown in soil with 0, 2, 4 or 6 mg Al kg-1. The effect of Al and inoculation on growth, nodulation, and nitrogen and tannins content in the plants was monitored. Height and total and dry root weight of plantlets decreased significantly when soil was spiked with Al, but increased when inoculated. Al decreased the number of nodules. Inoculum increased total N and tannin content of the plantlets. It was found that Al reduced the growth of the tropical leguminous N2-fixing shrub A. angustissima, while inoculation with S. mexicanum ITTG R7T stimulated its growth and increased its tannin and N content. KEYWORDS: Aluminium tolerance, plant growth, nodulation, nitrogen and tannins content, Sinorhizobium mexicanum ITTG R7T, soil. RESUMEN La leguminosa tropical Acaciella angustissima inoculada con o sin la cepa Sinorhizobium mexicanum ITTG R7T fue cultivada en un suelo tratado con (Al) para estudiar la tolerancia a este metal. Las plantas de A. angustissima fueron crecidas en el suelo con 0, 2, 4 y 6 mg de Al kg-1. Se hizo un seguimiento del efecto de Al e inoculación en el crecimiento, la nodulación, el contenido de nitrogeno y el contenido de taninos en las plantas. La altura, el peso seco total y el peso seco de la raíz de las plantas decrementó significativamente cuando el suelo fue tratado con Al, pero incrementó cuando fue inoculado. El Al disminuyó el número de nódulos. El inóculo incrementó el N total y el contenido de taninos de las plantas. En este experimento fue encontrado que el Al reduce el crecimiento de la leguminosa arbustiva tropical fijadora de N2 A. angustissima, mientras la inoculación con S. mexicanum ITTG R7T estimula el crecimiento e incrementa el contenido de taninos y nitrógeno. PALABRAS CLAVE: Tolerancia al aluminio, crecimiento de planta, nodulación, contenido de nitrógeno y taninos, Sinorhizobium mexicanum ITTG R7T, suelo. INTRODUCTION al. 2004). Below pH 5, Al becomes soluble and is bound 3+ to organic matter or found as Al or Al(OH)3 (Kinraide Intensive agriculture practices, such as the use of large 1991). Aluminium is highly toxic to plants and inhibits their amounts of N fertilizers, acidifies soil (Izaguirre-Mayoral development, decreases biomass production and crop yields + et al. 2002, Poschenrieder et al. 2008). Oxidation of NH4 (Kinraide & Hagerman 2010). Acid soils can be found in derived from urea or ammonium sulphate acidifies the large parts of the world, particularly in the tropics, limiting soil which increases the availability and thus the toxicity food production in most developing countries (Poschenrieder of certain metals, especially aluminium (Al) (Kochian et et al. 2008). 188 Aluminium tolerance of Acaciella angustissima inoculated with Sinorhizobium mexicanum: RINCÓN-ROSALES, R. ET AL. Al toxicity is associated with changes in the physiological pilot project (http://www.fao.org/news/story/en/item/80060/ and biochemical processes of plants and consequently their icode/). Its goal is to promote the use of Acacia plants to productivity (Mora et al. 2006, Meriño-Gergichevich et al. prevent erosion, restore soil fertility and to show how these 2010). The decrease in root growth is one of the initial and trees provide food, fuel, shelter and income during times of most evident symptoms of Al toxicity in plants (Chen et al. hardship. 2011), thereby reducing the capacity for water and nutrient It remains to be seen, however, if A. angustissima uptake. Above ground plant parts may also be affected by tolerates acid soils and large concentrations of Al. Therefore, Al phytotoxicity (Peixoto et al. 2002, Garzón et al. 2011). seedlings of A. angustissima were inoculated with or At the cellular level, toxic Al triggers an overproduction of without the strain S. mexicanum ITTG R7T and cultivated oxygen reactive species (ROS) in cells (Ma 2005, Meriño- in soil spiked with 0, 2, 4 or 6 mg Al kg-1. Growth, nodule Gergichevich et al. 2010), which alters the functionality formation, total N and tannin content were determined. The of the biomembranes inducing oxidative damage in plants objective of this study was to investigate the tolerance of A. (Boscolo et al. 2003, Cristancho et al. 2011). angustissima inoculated with S. mexicanum towards Al. Although exclusion from root tips and restriction of Al transport to upper plant parts seemed to be the most important mechanisms that allow certain crops and wild MATERIALS AND METHODS plants to grow on acid soils with high Al3+ availability, other species tolerate relatively high Al concentrations not only in BACTERIAL STRAIN roots (Barcelo & Poschenrieder 2002, Panda & Matsumoto Acaciella angustissima plants were inoculated with the S. 2007). mexicanum strain ITTG R7. This strain was isolated recently Phenolic compounds, such as the tannins, flavonols, from nodules of A. angustissima (Lloret et al. 2007). It is flavan-3-ols and anthocyanidins, are characterized by one characterized by a high potential to nodule formation and or more hydroxylated aromatic rings, and they represent a N2-fixation (Rincón-Rosales et al. 2009). The bacteria broad range of plant compounds (Tolrà et al. 2009). The was grown on PY medium (peptone of casein, 5.0 g; yeast concentration of phenolic compounds in plants can increase extract, 3.0 g; CaCl2, 0.6 g; distilled water, 1 l) at 28 ºC and when stressed. For instance, Chen et al. (2011) reported that preserved at 4 ºC until used (Toledo et al. 2003). tea plants increased the amount of phenolic compounds, i.e. catechin, when exposed to elevated Al concentrations. SEED TREATMENT AND GERMINATION Exudation of phenolic compounds by the roots might play Seeds of A. angustissima were scarified with concentrated a role in the exclusion of Al. Phenolic compounds can form H2SO4 for 10 min, surface sterilized with 1 % (v/v) complexes with metals, such as Al, thereby reducing their hypochlorite for 10 min and rinsed eight times with sterile toxic effects (Kochian et al. 2004, Chen et al. 2011). distilled water (Rincón et al. 2003). Treated seeds were Acaciella angustissima (Mill.) Britton & Rose is a germinated on 0.8 % agar-water plates at 28 ºC for 48 h leguminous N2-fixing shrub that was formerly considered (Ruiz-Valdiviezo et al. 2009). as a Mimosa species and later as a member of the Acacia, but has now been classified as belonging to the genera SOIL CHARACTERISTICS, TREATMENT AND EXPERIMENTAL DESIGN Acaciella together with other American acacias (Rico- A clayey soil (type oxisols) was collected at Parral in the Arce & Rodríguez 1998, Rico-Arce & Bachean 2006). A. municipality of Villacorzo, Chiapas, Mexico (16º 11’ N, angustissima can be found in arid and semiarid regions of 93º 16’ W and 580 m altitude). The soil was cultivated with Mexico (Rzedowski 1978). It is used as firewood, the leaves maize and common bean for > 50 y. The soil with pH H2O as forage for goats and sheep and its bark has traditionally (1:2) 4.6 and EC 0.36 dS m-1, had an organic carbon content been extracted for tannins used to tan hide (Rincón-Rosales of 1.8 g kg-1 soil and a cation exchange capacity of 14.36 & Gutiérrez-Miceli 2008). This legume is characterized by cmole (p+) kg-1 soil. The extractable Al was 3.0 mg kg-1 a tuberous main root with numerous lateral ones, abundant soil. foliage and fast growth (Dzowella 1994, Rico-Arce & Two kg air-dried and 2 mm-sieved soil was sterilized T Bachean 2006). It establishes a symbiosis with N2-fixing to study the specific effects of S. mexicanum ITTG R7 bacteria. Recently, one of the strains that was isolated from strain and added to polyethylene-lined earth pots to avoid A. angustissima was Sinorhizobium mexicanum ITTG R7T contamination. Fifty ml of an aluminium sulfate solution characterized by a large acidity and salinity tolerance (Lloret was added to the soil at four application rates, i.e. 0, 2, 4 or et al. 2007). A. angustissima can grow in nutrient depleted 6 mg Al kg-1 soil. The pots were saturated with deionized saline or acid soils under semi-arid conditions (Ponce- water and stored for 30 days to equilibrate the applied Al. Mendoza et al. 2006). A. angustissima could thus easily Ten seeds scarified as described above were placed in be used to revegetate eroded soil and as such restore soil each pot and thinned to five plants when the seedlings lost the fertility. Concordantly, the FAO has developed the Acacia cotyledon, i.e. approximately 10 d after sowing. Half of the 189 Gayana Bot. 68(2), 2011 seedlings were inoculated with 2 ml of a solution with 1×106 PLANT CHARACTERISTICS cells of S. mexicanum ITTG R7T strain ml-1 while the other Total N in the plants was determined using the Kjeldahl half was left inoculated. A sterile quarter strength Jensen´s method (Bremner 1996).
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